satip-axe/kernel/sound/stm/conv_i2c.c

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/*
* STMicroelectronics System-on-Chips' I2C-controlled ADC/DAC driver
*
* Copyright (c) 2005-2011 STMicroelectronics Limited
*
* Author: Pawel Moll <pawel.moll@st.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <linux/init.h>
#include <linux/io.h>
#include <linux/platform_device.h>
#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/i2c.h>
#include <sound/core.h>
#include <sound/info.h>
#include <sound/stm.h>
#include "common.h"
static int snd_stm_debug_level;
module_param_named(debug, snd_stm_debug_level, int, S_IRUGO | S_IWUSR);
/*
* Internal converter instance structure
*/
struct snd_stm_conv_i2c {
/* System informations */
struct i2c_client *client;
struct snd_stm_conv_converter *converter;
struct snd_stm_conv_i2c_info *info;
struct snd_stm_conv_ops ops;
/* Runtime data */
struct work_struct work;
int work_enable_value;
int work_mute_value;
spinlock_t work_lock; /* Protects work_*_value */
struct snd_info_entry *proc_entry;
snd_stm_magic_field;
};
/*
* Implementation
*/
static void snd_stm_conv_i2c_work(struct work_struct *work)
{
struct snd_stm_conv_i2c *conv_i2c = container_of(work,
struct snd_stm_conv_i2c, work);
int enable_value, mute_value;
const char *cmd;
int cmd_len;
snd_stm_printd(1, "snd_stm_conv_i2c_work(work=%p)\n", work);
BUG_ON(!conv_i2c);
BUG_ON(!snd_stm_magic_valid(conv_i2c));
spin_lock(&conv_i2c->work_lock);
enable_value = conv_i2c->work_enable_value;
conv_i2c->work_enable_value = -1;
mute_value = conv_i2c->work_mute_value;
conv_i2c->work_mute_value = -1;
spin_unlock(&conv_i2c->work_lock);
cmd = NULL;
if (enable_value == 1) {
cmd = conv_i2c->info->enable_cmd;
cmd_len = conv_i2c->info->enable_cmd_len;
} else if (enable_value == 0) {
cmd = conv_i2c->info->disable_cmd;
cmd_len = conv_i2c->info->disable_cmd_len;
}
if (cmd) {
int result = i2c_master_send(conv_i2c->client, cmd, cmd_len);
if (result != cmd_len)
snd_stm_printe("WARNING! Failed to %sable I2C converter"
" '%s'! (%d)\n",
enable_value ? "en" : "dis",
dev_name(&conv_i2c->client->dev),
result);
}
cmd = NULL;
if (mute_value == 1) {
cmd = conv_i2c->info->mute_cmd;
cmd_len = conv_i2c->info->mute_cmd_len;
} else if (mute_value == 0) {
cmd = conv_i2c->info->unmute_cmd;
cmd_len = conv_i2c->info->unmute_cmd_len;
}
if (cmd) {
int result = i2c_master_send(conv_i2c->client, cmd, cmd_len);
if (result != cmd_len)
snd_stm_printe("WARNING! Failed to %smute I2C converter"
" '%s'! (%d)\n", mute_value ? "" : "un",
dev_name(&conv_i2c->client->dev),
result);
}
}
static unsigned int snd_stm_conv_i2c_get_format(void *priv)
{
struct snd_stm_conv_i2c *conv_i2c = priv;
snd_stm_printd(1, "snd_stm_conv_i2c_get_format(priv=%p)\n", priv);
BUG_ON(!conv_i2c);
BUG_ON(!snd_stm_magic_valid(conv_i2c));
return conv_i2c->info->format;
}
static int snd_stm_conv_i2c_get_oversampling(void *priv)
{
struct snd_stm_conv_i2c *conv_i2c = priv;
snd_stm_printd(1, "snd_stm_conv_i2c_get_oversampling(priv=%p)\n",
priv);
BUG_ON(!conv_i2c);
BUG_ON(!snd_stm_magic_valid(conv_i2c));
return conv_i2c->info->oversampling;
}
static int snd_stm_conv_i2c_set_enabled(int enabled, void *priv)
{
struct snd_stm_conv_i2c *conv_i2c = priv;
snd_stm_printd(1, "snd_stm_conv_i2c_enable(enabled=%d, priv=%p)\n",
enabled, priv);
BUG_ON(!conv_i2c);
BUG_ON(!snd_stm_magic_valid(conv_i2c));
BUG_ON(!conv_i2c->info->enable_supported);
snd_stm_printd(1, "%sabling DAC %s's.\n", enabled ? "En" : "Dis",
dev_name(&conv_i2c->client->dev));
spin_lock(&conv_i2c->work_lock);
conv_i2c->work_enable_value = enabled;
schedule_work(&conv_i2c->work);
spin_unlock(&conv_i2c->work_lock);
return 0;
}
static int snd_stm_conv_i2c_set_muted(int muted, void *priv)
{
struct snd_stm_conv_i2c *conv_i2c = priv;
snd_stm_printd(1, "snd_stm_conv_i2c_set_muted(muted=%d, priv=%p)\n",
muted, priv);
BUG_ON(!conv_i2c);
BUG_ON(!snd_stm_magic_valid(conv_i2c));
BUG_ON(!conv_i2c->info->mute_supported);
snd_stm_printd(1, "%suting DAC %s.\n", muted ? "M" : "Unm",
dev_name(&conv_i2c->client->dev));
spin_lock(&conv_i2c->work_lock);
conv_i2c->work_mute_value = muted;
schedule_work(&conv_i2c->work);
spin_unlock(&conv_i2c->work_lock);
return 0;
}
/*
* I2C driver routines
*/
static int snd_stm_conv_i2c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
int result = 0;
struct snd_stm_conv_i2c *conv_i2c;
snd_stm_printd(0, "%s('%s')\n", __func__, dev_name(&client->dev));
BUG_ON(!client->dev.platform_data);
conv_i2c = kzalloc(sizeof(*conv_i2c), GFP_KERNEL);
if (!conv_i2c) {
snd_stm_printe("Can't allocate memory "
"for a device description!\n");
result = -ENOMEM;
goto error_alloc;
}
snd_stm_magic_set(conv_i2c);
conv_i2c->client = client;
conv_i2c->info = client->dev.platform_data;
conv_i2c->ops.get_format = snd_stm_conv_i2c_get_format;
conv_i2c->ops.get_oversampling = snd_stm_conv_i2c_get_oversampling;
if (conv_i2c->info->enable_supported)
conv_i2c->ops.set_enabled = snd_stm_conv_i2c_set_enabled;
if (conv_i2c->info->mute_supported)
conv_i2c->ops.set_muted = snd_stm_conv_i2c_set_muted;
/* Call the user-provided init function */
if (conv_i2c->info->init) {
result = conv_i2c->info->init(client, conv_i2c->info->priv);
if (result != 0) {
snd_stm_printe("User's init function failed for I2C "
"converter %s! (%d)\n",
dev_name(&conv_i2c->client->dev),
result);
goto error_init;
}
}
/* Get connections */
BUG_ON(!conv_i2c->info->source_bus_id);
snd_stm_printd(0, "This converter is attached to '%s'.\n",
conv_i2c->info->source_bus_id);
conv_i2c->converter = snd_stm_conv_register_converter(
conv_i2c->info->group, &conv_i2c->ops, conv_i2c,
&platform_bus_type, conv_i2c->info->source_bus_id,
conv_i2c->info->channel_from,
conv_i2c->info->channel_to, NULL);
if (!conv_i2c->converter) {
snd_stm_printe("Can't attach to PCM player!\n");
result = -EINVAL;
goto error_attach;
}
/* Initialize the converter */
INIT_WORK(&conv_i2c->work, snd_stm_conv_i2c_work);
spin_lock_init(&conv_i2c->work_lock);
conv_i2c->work_enable_value = -1;
conv_i2c->work_mute_value = -1;
if (conv_i2c->info->enable_supported) {
result = i2c_master_send(client, conv_i2c->info->disable_cmd,
conv_i2c->info->disable_cmd_len);
if (result != conv_i2c->info->disable_cmd_len) {
snd_stm_printe("Failed to disable I2C converter '%s'!"
" (%d)\n",
dev_name(&conv_i2c->client->dev),
result);
goto error_set_enabled;
}
}
if (conv_i2c->info->mute_supported) {
result = i2c_master_send(client, conv_i2c->info->mute_cmd,
conv_i2c->info->mute_cmd_len);
if (result != conv_i2c->info->mute_cmd_len) {
snd_stm_printe("Failed to mute I2C converter '%s'!"
" (%d)\n",
dev_name(&conv_i2c->client->dev),
result);
goto error_set_muted;
}
}
/* Done now */
i2c_set_clientdata(client, conv_i2c);
return 0;
error_set_muted:
error_set_enabled:
snd_stm_conv_unregister_converter(conv_i2c->converter);
error_attach:
error_init:
snd_stm_magic_clear(conv_i2c);
kfree(conv_i2c);
error_alloc:
return result;
}
static int snd_stm_conv_i2c_remove(struct i2c_client *client)
{
struct snd_stm_conv_i2c *conv_i2c = i2c_get_clientdata(client);
BUG_ON(!conv_i2c);
BUG_ON(!snd_stm_magic_valid(conv_i2c));
snd_stm_conv_unregister_converter(conv_i2c->converter);
/* Wait for the possibly scheduled work... */
flush_scheduled_work();
/* Muting and disabling - just to be sure ;-) */
if (conv_i2c->info->mute_supported)
i2c_master_send(client, conv_i2c->info->mute_cmd,
conv_i2c->info->mute_cmd_len);
if (conv_i2c->info->enable_supported)
i2c_master_send(client, conv_i2c->info->disable_cmd,
conv_i2c->info->disable_cmd_len);
snd_stm_magic_clear(conv_i2c);
kfree(conv_i2c);
return 0;
}
static struct i2c_driver snd_stm_conv_i2c_driver = {
.driver.name = "snd_conv_i2c",
.probe = snd_stm_conv_i2c_probe,
.remove = snd_stm_conv_i2c_remove,
};
/*
* Initialization
*/
static int __init snd_stm_conv_i2c_init(void)
{
return i2c_add_driver(&snd_stm_conv_i2c_driver);
}
static void __exit snd_stm_conv_i2c_exit(void)
{
i2c_del_driver(&snd_stm_conv_i2c_driver);
}
MODULE_AUTHOR("Pawel Moll <pawel.moll@st.com>");
MODULE_DESCRIPTION("STMicroelectronics I2C-controlled audio converter driver");
MODULE_LICENSE("GPL");
module_init(snd_stm_conv_i2c_init);
module_exit(snd_stm_conv_i2c_exit);